Lakeshore Records will release the Room – Original Motion Picture Soundtrack digitally on October 16 and CD November 6, 2015. The film features original music by Stephen Rennicks. In addition to the original score, the soundtrack also features Brie Larson's performance of "Big Rock Candy Mountain" and "The Mighty Rio Grande" performed by This Will Destroy You.
"Lenny and I began to feel that Jack's voiceovers, which offer us glimpses into how Ma has turned their tiny confined space into a world full of possibility and stimulation for her son, should have a musical element that would help to represent his unquestioningly benign child's view of everything he encounters," Rennicks described.
"The challenge was to find a piece that could celebrate Jack's positivity without being entirely in conflict with the horror of his situation that we as the audience are so aware of," Rennicks explained. "This was the key in many ways to the rest of the film's score because we could dial things up and down from there, as Jack begins to discover that there is more beyond the walls, roof and floor of his world, the music moves away tonally from the initial rendering of his voiceover theme."